The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?

Related Mcqs:

1. In heat exchangers, degree of approach is defined as the difference between temperatures of________________?

   A. cold water inlet and outlet
   B. hot medium inlet and outlet
   C. hot medium outlet and cold water inlet
   D. hot medium outlet and cold water outlet
   E. none of the above

2. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?

   A. absolute temperature
   B. square of temperature
   C. fourth power of absolute temperature
   D. fourth power of temperature
   E. cube of absolute temperature

3. The ratio of the energy absorbed by the body to total energy falling on it is called_________________?

   A. absorptive power
   B. emissive power
   C. absorptivity
   D. emissivity
   E. none of the above

4. Unit of thermal conductivity in M.K.S. units is ___________________?

   A. kcal/kg m2 °C
   B. kcal-m/hr m2 °C
   C. kcal/hr m2 °C
   D. kcal-m/hr °C
   E. kcal-m/m2 °C

5. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?

   A. conduction
   B. convection
   C. radiation
   D. conduction and convection
   E. convection and radiation

6. Heat flowing from one side to other depends directly on ___________________?

   Pick up the wrong case?

   A. face area
   B. time
   C. thickness
   D. temperature difference
   E. thermal conductivity

7. Which of the following is the case of heat transfer by radiation ___________________?

   A. blast furnace
   B. heating of building
   C. cooling of parts in furnace
   D. heat received by a person from fireplace
   E. all of the above

8. Which of the following is a case of steady state heat transfer ___________________?

   A. I.C. engine
   B. air preheaters
   C. heating of building in winter
   D. all of the above
   E. none of the above

9. The value of the wavelength for maximum emissive power is given by ___________________?

   A. Wien’s law
   B. Planck’s law
   C. Stefan’s law
   D. Fourier’s law
   E. Kirchhoff’s law

10. Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

    A. convection
    B. free convection
    C. forced convection
    D. radiation
    E. radiation and convection